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There are numerous species of beetles in this family – about 1500 – that feed on plant leaves, including those on many ornamental plants. Some of the more important members of this group for ornamentals producers include cucumber beetles (also known as corn rootworm adults), elm leaf beetles, viburnum leaf beetles, cranberry rootworm adults and flea beetles.

As their name implies, most leaf beetles feed on leaves and flowers as adults and larvae. Larvae of some species feed on plant roots. Larvae often eat only part way through the leaf surface leaving a thin semi–transparent window of tissue between the leaf veins. Adults chew holes completely through the leaf. Injury is usually on the interior areas of leaves, not the edges as with root weevil adults

The life cycles of different species varies. Some overwinter as adults, others as larvae and still others as eggs. The number of annual generations also varies with species and geography.

Discus™ – Nursery Insecticide
Apply 25 fluid ounces per 100 gallons as a foliar spray; OR apply 3.4 to 5.6 fluid ounces per 1000 ft2 as a spray to the soil surface, followed by irrigation or rainfall to move the active ingredient to the root zone. Use at least 2 gallons of spray volume per 1000 ft2; OR apply .75–1.5 fluid ounces per inch of trunk diameter (at breast height) or per foot of shrub height. Use a minimum of 10 gallons of water per 1000 ft2 as a drench; OR mix 13 fluid ounces (385 ml) in the appropriate amount of water for drenching containers of different sizes (see label)

Marathon® II – Systemic and Translaminar Insecticide
Apply 1.7 fluid ounces (50 ml) per 100 gallons as a foliar spray; OR mix 1.7 fluid ounces in the appropriate amount of water for drenching containers of different sizes (see label); OR apply 0.1–0.2 fluid ounces per inch of trunk diameter (at breast height) or per foot of shrub height. Use a minimum of 10 gallons of water per 1000 ft2 as a drench. Shake well before using.

Marathon® 60WP in WSP – Systemic Insecticide
Mix one 20 gram packet in the appropriate amount of water for drenching containers of different sizes (see label) OR apply one 20 gram packet per 8 to 16 inches of cumulative trunk diameter (at breast height) or per 8 to 16 feet of cumulative shrub height. Use a minimum of 10 gallons of water per 1000 ft2 as a drench.

Marathon® 1% G – Systemic Insecticide
Marathon® 1% Granular systemic insecticide is applied topically to the growing media or incorporated prior to planting.
See label for application rates for different container sizes; OR Apply 15 ounces per 1000 ft2.

Decathlon™ 20 WP – Synthetic Pyrethroid
Apply 1.9 ounces (54 grams) per 100 gallons as a foliar spray to control adults. Tank mix with Azatin XL insect growth regulator to improve control of larvae. Repeat applications at 5–7 day intervals.